CVE-2026-19559: Google Chrome Use-After-Free Vulnerability

CVE-2026-19559 Overview

CVE-2026-19559 is a use-after-free vulnerability in the HTML component of Google Chrome prior to version 151.0.7922.137. A remote attacker can exploit this flaw by serving a crafted HTML page to a victim's browser. Successful exploitation allows arbitrary code execution within the Chrome renderer sandbox. Google's Chromium security team rated the severity as High, and the vulnerability affects the desktop stable channel of Chrome. The flaw is classified under CWE-416: Use After Free and requires user interaction, typically visiting an attacker-controlled web page.

Critical Impact
Remote attackers can execute arbitrary code inside the Chrome renderer sandbox by luring users to a crafted HTML page, providing a foothold that may be chained with a sandbox escape for full system compromise.

Affected Products

Google Chrome Desktop versions prior to 151.0.7922.137
Chromium-based browsers incorporating the vulnerable HTML rendering code
Downstream distributions bundling affected Chromium builds

Discovery Timeline

2026-08-11 - CVE-2026-19559 published to NVD
2026-08-13 - Last updated in NVD database

Technical Details for CVE-2026-19559

Vulnerability Analysis

The vulnerability resides in Chrome's HTML processing code. A use-after-free (UAF) condition occurs when the browser continues to reference a memory object after that object has been freed. Attackers can manipulate the freed memory region and coerce the renderer into dereferencing attacker-controlled data. This behavior enables arbitrary code execution constrained to the renderer sandbox. Because the flaw is triggered through standard HTML parsing and Document Object Model (DOM) manipulation, exploitation requires only that a user visit or be redirected to a malicious page.

Root Cause

The issue stems from improper object lifetime management within the HTML subsystem [CWE-416]. When an object is deallocated but a dangling pointer persists, subsequent operations can trigger reuse of the freed allocation. Attackers reclaim the freed slot with controlled data structures, corrupting internal state and hijacking execution flow inside the renderer process.

Attack Vector

The attack vector is network-based with low complexity but requires user interaction. A remote attacker hosts a crafted HTML page containing specific DOM manipulations that trigger the free-then-reuse condition. When a victim navigates to the page, the renderer processes the malicious markup and executes attacker-supplied code within the sandbox. Combined with a separate sandbox escape, this could lead to full compromise of the host operating system. Refer to the Google Chrome Update Announcement and the Chromium Issue Tracker Entry for technical context.

Detection Methods for CVE-2026-19559

Indicators of Compromise

Unexpected Chrome renderer process crashes or hangs correlated with browsing sessions
Outbound network connections initiated from Chrome to unfamiliar or newly registered domains following page loads
Spawning of child processes from chrome.exe that deviate from normal browser behavior
Endpoint telemetry showing Chrome writing executables or scripts to disk after navigation events

Detection Strategies

Inventory installed Chrome versions across the fleet and flag hosts running builds earlier than 151.0.7922.137
Correlate browser crash reports with URL visit history to identify potential exploitation attempts
Deploy behavioral endpoint detection rules that alert on anomalous process trees originating from the browser

Monitoring Recommendations

Ingest browser telemetry, DNS logs, and endpoint process events into a centralized analytics platform for correlation
Monitor for renderer sandbox escape indicators such as unexpected token manipulation or privilege changes tied to Chrome
Track threat intelligence feeds for weaponized exploit reports referencing CVE-2026-19559

How to Mitigate CVE-2026-19559

Immediate Actions Required

Update Google Chrome to version 151.0.7922.137 or later on all Windows, macOS, and Linux endpoints
Restart the browser after installing the update to ensure the patched binaries are loaded
Verify that Chromium-based browsers used in the environment have incorporated the upstream fix

Patch Information

Google addressed CVE-2026-19559 in the Chrome stable channel release 151.0.7922.137. Details are published in the Google Chrome Update Announcement. Enterprise administrators should validate that automatic update mechanisms are functional and push the update through configuration management where auto-update is disabled.

Workarounds

Enforce browsing restrictions that block untrusted or newly registered domains until patching completes
Enable site isolation and strict sandboxing policies to reduce the blast radius of renderer compromise
Deploy web content filtering and DNS-layer protections to reduce the likelihood of users reaching exploit pages

bash

# Verify installed Chrome version on Linux endpoints
google-chrome --version

# Windows: query installed version via registry
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version